Calendar slide-rule.



. LEWIS.

CALENDAR SLIDE RULE.

APPLICATION FILED Aus. 3. I9I5.

Patented Apr. 25, 1916.

STATES PATENT onirica.

'nN'DnnwJi". Lnwis, or' PORTLAND, OREGON.

I CALENDAR SLIDE-'RULE vide an improved construction of calendarsliderule for accurately determining the number of days on which interest anddiscount is to be calculated, and for general use a simple time savingdevice for counting `the number of days from any date to a'iliy oaccomplish this object the invention pro vides an improvedconstructionof calendar v in which is included two arts relativelyadjustable, oneof 'which Orms a base upon whichis arbitrarily arrangedthe calendar of two full years with the days of the month arranged inlines of seven days each and iii seven long vertical columns with thesmer- Y hereinafter bols or iguresof the seven columns di ently rintedin such a way as to aid the eye in fo owing a column, the monthindicator being placed to the left of each set of week day ines thatconstitute a complete month, the other part of the said calendar beingin the-nature of a slide frame which includes right and left verticalmembers joined at the top and bottom by end members, the verticalmembers of the said slide frame inside v.the ends having fifty-threelines of figures that indicate the total number of days in a year plusthe last week of a preceding year when the frame is placed at the top ofthe calendar.

With other objects in view that will here-..

inafter appear, my invention is an improved slide rule calendar thatembodies the peculiar construction and arrangement of parts fullydescribed, specifically 'pointed out in the `appended claims andillustrated in the accompanying drawings, in which P l Figure 1 is aface view of my improved `'slide rule calendar. Fig. 2 is a transversesection of the same on the line 2-2 of Fig. 1. Fi 3 is'a front view of-the same, the slide ame bein at the position X hereinafter e laine somuch of the day and month in icator symbols or igures being yshown'as isnecessary to illustrate the operai' tive adjustment of the severalparts. Fig.

`Specification of Letters Patent.

PatentedA Apr. 25, 1916.

4 is a' similar view, the slide frame being at the position Yhereinafterparticularly ex lained.

y improved slide rule calendar which is composed of two parts, a mainbody or base member and a movable frame that is slidably mountedthereon, may be formed of any suitable material and when my improveddevice is to be put up in a cheap form, particularly adapted for use asan advertising medium, it is preferably made of wood, Celluloid4 orheavy cardboard to provide for conveniently printing the desiredadvertisement on the blank or back side thereof. Thebase member 1, whichis in the nature of a rule, is of sufficient length and width to includea system of lines and columns of figures that indicate the days, weeksand months of at least two full years, it being understood that the saidbase or rule member 1 may vary in length and width, according to thesize of the type in printing the calendar on the face of the rule. Atone, or both, edges the rule member 1 is marked oi into inches, asdesignated by 2, and that portion of face 10 of the member 1 that hasthe symbols or printed figures is thickenedv to provide oppositeundercut edges 3, the purpose of which will presently appear. The daysof the months are arranged in lines of seven days each, andthe saidlines are hereinafter designated the week lines 4, and the symbols' orfigures that indicate the days of the month are, in consequence, shownin seven long vertical columns hereinafter designated the date columns5, and some of the said columns, preferably the second, fourth and sixthcolumns are printed in black face type, the others bein in light facetype to thereby aid the eye in following such column. For calendarpurposes, January first is placed in the column in the first week line 4under the day of the week that the year begins, as arranged in calendarsinY general use; for counting purposes, January first is placed in anyofy the date colunms 5 in the first line. 6 designates a slide framewhich consists of an upper and lower end member -61 which extendtransversely over the calendar face of the member 1 and .vertical sidemembers 62-62' join with the side-end members 60--61 and which ride upontheouter or flanged edges of the base 1` with their inner Aco edgesextended under for engaging-the undercut 3 of the said face portion 10,as shown m Fig. 2, by reference to which it will also be noticed theupper surface of the side members are even with the calendar face 10.The upper edges of the end members --61 of the .slide frame, move overthe calendar face 10 parallel with its week lines 4 and the insidelength of the sides 62, between the ends 60-61 is such as to includefifty-three week lines on the calen- -dar face to provide for having atall times 365 da s in a vertical column on each of the sai sides 62 whenin an position on the calendar, the date from being excluded from thecount. Letters '7 indicating the days of the week from the calendar maybe placed on the end members 60-61 to ride over the date columns 5, aswill be clearly understood from Fig. 1 of the drawings, which also showsthe figures on the sides 62 of the slide frame stepped in week totalsfrom 0 ,to 7, 14, 21 and so on.

By reason of the arrangement of the system of figures in transverselines and vertical columns on the base member 1, and a sliding framewith a system of figures stepped in sums of seven days for eachsuccessive line, I have provided a simple and readily manipulated meansor device for indicating the number of days of any column down from thetop end to any line below, or from the bottom end up any column withinthe sliding frame. With the sum of the successive seven days indicatedon the frame before or following each line it is an easy process to indthe number of days between a certain date in one month and another dayin another month counting backward or forward. There are as many sevensdown or up a vertical column from a date in a line as dates below orabove indicated on the right or left side member 62 of the frame 6.

To count forward, the lower ed of the top end 60 of the sliding frame 1smoved just above a week line in the calendar containin the day from,follow the column down rom the date from to the line containing the dateto if more days in the line to the right of the column, add the numberof days to the number on the frame to the ri ht of the line; if lessdays to the left ofg the column, subtract the number of da s fromv thenumber on the frame to the rig t of the line. In an case the most to addor subtract is six ays. Six of the same days of a month of any line ofthe calendar under the lower side of the upper end of the sliding frameare found at the bottom of the frame above the upper side of the lowerend thereof (see Fig. 1). Counting backward is the reverse of countingforward. The left side member 62 is used for the back count.

not be changed from year to year. When The manner in which my slide rulecalendar is used is best ex lamed as follows: To find'the `number of a sfrom February 22nd to July 4th, forward, move the lower side of theupper end 60 of the slide frame just above the line containing February22nd so that the lines ofl the calendar and the members of the slideframes sides will register (see position X Fig. 3) and followthe-vertical column of figures of the calendar down 'from February 22ndto the line containing July 4th. The sum 'of the successive sevens toand including July 5th in the same column is 133 days, indicated on theright hand side 62 of the frame 6. July 4th is to the left of the columnor one day less, or 132, the number of the days between February 22ndand July 4th counting forward. To count backwardly, set the frame 6 tothe position Y, as indicated in Fig. 4, which shows the lower end justbelow the lowermost line containing February 22nd and reading up thevertical column of figures of the calendar from February 22nd to theline containing July 4th, the sum of the successive seven days to andincluding July 6th-in the same column with the lowermost February 22ndis 231, indicated on the left side of the frame 6. There are two moredays to July 4th counting 95 backward, or 233 days, the number of daysbetween February 22nd and July 4th counting backward.

For counting purposes the calendar need February has 29 days an eXtraday may be added to the count. For calendar and counting purposes thecalendar may be used for different years by changing the days of theweek on the end members 60-61.

To find when a note matures made March 4 and due in ninet days, move thelower side of the upper end 60 just above March '4th, follow thevertical column of figures on the right hand side 62 of frame 6 to 9111o on frame. June 3rd in line to the left is 91 days from March 4th;one day less would be June 2nd when note matures.

From the foregoing taken in connection with the accompanying drawing,the complete arrangement and the several uses for which my calendar isadapted will be readily apparent to those skilled in the art. It isobvlous that the device may be used as a foot rule, a ruler, a calendarand means for quickly determining the number of days between twodiiierent dates.

The operation ofA my invention is simple, and among other advantages isthe ease and efliciency of such operation, the low cost of manufactureso that it may be readily utilized as an advertising medium, thenonliability of the parts becoming inoperative and the coperatlveconnection of the calendar carrying base or member and the slide 1.0

frame by which with a minimum amount of labor and time, the informationdesired is attained.

What l claim is:

l. A calendar of the character described, comprising two members mountedfor movement relative to each other, one of the members having acalendar base carrying a series of vertical colums horizontally dividedinto a series of lines indicating successive week days in a year, aslide frame including upper and lower cross members, the upper one ofwhich is adapted for being set with its lower edge over the horizontalline of gures in which is included the from date, said sliding framehaving rows of iigures at the right and left hand edges spaced to formweek intervals and adapted for being brought into register with the weeklines of the vertical columns that indicate the days of the week.

2. in a device of the character stated, a base member and a slide membermounted thereon, a continuous monthly calendar on the face of the saidbase member and extending in a vertical column and embracingperiod oftwo years, said slide member having an opening to expose approximatelyone-half of the said calendar, said slide member having side columnsparalleling the calendar and graduated to indicate successive periods ofseven days each, said slide member having two transverse straight edgesspaced apart a distance equal to fifty-three week lines or" thecalendar.

l. A calendar of the character described, comprising a base memberhaving a central longitudinally extended raised portion having undercutedges, a continuous monthly calendar embracing a period of two years andcomprising a series of vertical columns indicating days of the week andtransversely divided into horizontal lines indicating weeks of the monthon the face of the said raised portion, and a slide frame consisting ofupper and lower end members movable over the calendar face of the basemember in parallelism with the week lines of the month and sides thatslidably engage the undercut edges of the calendar face and whichconnect with the end members, and said sides each having a column offigures paralleling the horizontal lines of the calendar and graduatedto indicate successive periods of seven days each, the column on one ofthe said sides reading from the top down and the column on the otherside reading from the bottom up.

ANDREW T. LEWS.

ln the presence o- E. E. Lnwis, M. FREEMAN.

